[thefitz]

So I noticed my laser cutting thicker materials at a slight angle, and aware that this is somewhat natural due to laser strength and air assist didn't think too much of it. However, I now noticed it is actually cutting at an angle (over cutting at the top of the piece and undercutting at the bottom).
I've spent quite a few hours now realigning all mirrors, and just can't seem to get the laser to leave mirror #3 perpendicular to the bed. Or when I think it is, it is not leaving the nozzle. I've searched everywhere for something that resembles this particular problem and have followed mirror alignment guides including the Rabbit Laser one ( http://www.rabbitlaserusa.com/Manual...Alignment.html).

I'm left thinking the whole mirror #3 and nozzle piece is somehow misaligned as a unit? You can see in the photo that the nozzle doesn't appear to be perpendicular to the bed (and yes I've checked the bed and machine with a spirit level)
The second photo shows where the laser lands at a distance. Any adjustments to bring the laser to center is when the laser gets lost in the nozzle.
Really appreciate any help with this one!

[fixtureman1]

I had to shim one side of my lens holder to get a cut that wasn't angled it is call tramming the head

[thefitz]

Thanks for info...I'll check it out. Is there any go to resource on how to best do this?

[TechGraphix]

Is this black tube with tape, your lensholder?? It is surely misplaced..
When you post a clear picture of the whole part (with mirror, lensholder etc) I can think out what to do.. Are you able to make things yourself? (do you have something like a lathe, CNC-mill etc)

Kees

[thefitz]

Yes, that is the lensholder. I'll get a photo of the whole part, but I am definitely thinking fixtureman was on the money. Just a matter of working out how to go about it as I can't make things myself.

[tcorder]

From what I can see from your photos the 3rd mirror / lens tube holder need to be turned fractionally to make the lens tube vertical. If the hole of the screws holding it on are large enough, then just loosening them a bit and turning anticlockwise might be enough to make the assembly square to the bed. If they're not large enough, then I would remove the assembly and either drill or file the holes a little larger to allow the assembly to turn enough to get it vertical. Good luck!

[scotty c]

If the lens is off like that I would do what TCorder said and maybe drill both holes just a little larger to get more movement.

[thefitz]

Thanks for the ideas. I'm not entirely sure what you are getting at with drilling out the holes, but I think I've fixed it by mounting a bit of high density rubber between the two bottom screws, allowing me to adjust the angle by tightening/loosening them. Will see how it holds up after a bit of use.